Worked on improving the reliability of the oxidecomputer/omicron repository by addressing a critical issue in the Nix Flakes-based build system. Focused on build systems and DevOps, the work involved updating nixpkgs and rust-overlay revisions and hashes to match the targeted Rust toolchain version, using the Nix language. This technical approach resolved lock versioning conflicts, ensuring deterministic and reproducible builds across different environments. By eliminating dependency resolution drift, the changes stabilized continuous integration workflows and reduced manual intervention for developers. No new features were introduced during this period, as the primary goal was to enhance stability and maintainability of the build process.